Typewriting machine



May 1,1 1926. 1,583,781

c. M. cREws TYPEWRITING MACHINE Filed June 5,- 1924 4 Sheets-Srheet 1 Iffii M5 May 11 1926.

' j 1 1,583,781 l c. M. cREws A TYPEWRITING MACHINE Filed June 5 1924 4Sheets-Sheet 2 Affe/wey May 11,1926. 1,583,781"v c. M. cREws TYPEWRITINGMACHINE Filed June 5, 1924 4 Sheets-Shet 3 /fi ven far May' 11 1926.1,583,781

C. Mv. CREWS TYPEWRI T ING MACHINE Filed June 5, 1924 4 Sheets-Sheet 4.

M MM@ Patented May 11, 1926. V

y 1,583,781?-j` UNITED AsTn'rEs PATENT oFF-ICE:

CLARENCE MI.l CREWS, OF BROOKLYN, NEW YORK,.ASSIGNOR TO UNDERWOOD TYPE-WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITNG MACHINE.

Application led June 5, 1924..` Serial No. 717,920;

This invention relates to typewriting of the class known as, continuousbilling, in which class ofV Work a multiple ply continuous work-webordinarily is interleaved with carbons carried by a carbon-carrier thatis advanceable toward the platen at line-feeding and retractible to eectrelative shifting of the work-Web and carbons upon displacement oftheplaten.

The present invention has certain features in common withv my vpendingapplication, Serial No. 717,009, tiled May 31, 1924. That is, it is anobject of the present invention, as in the application referred to, toobviate the displacing of the platen and to eliminate the carbon-carrieraltogether.

It is a. further object of the present invention to provide rapidoperating means for locating the Work-Web and carbons -nexactcarbon-shifting position for clamping the carbons stationary andfor theneffecting a mechanically measured shifting of the Work-Web relatively tothel carbons, whereby the shifting may be effected quickly andaccurately, and Without reliance upon the operators observation of theWork-Web and the carbons. y

In attaining the above-mentioned objects, use is made of discretecarbons of substantially greater Width than the .Work-Web,v whichcarbons are preferably interleaved with the work-Web in such manner thatthey protrude at both side; margins beyond the sides of the Work-Web.The carbons are unattached to the machine, and arel fecdable by and withthe .Work-Web upon rotation of the platen. -When, at the conclusion oftyping a form, it is desired to effect a relative shift between theWork-Web and carbons, the platen is rotated backward to feed the carbonsto a definite carbon-shifting position in which they are straight andfree of the, platen at the rear thereof. Provision is made of means toclamp the carbons stationary in this carbon-shifting position, While theWork-Web is advanced a form-length by rotation of the platen.

Platen-sweep mechanism is provided for rapidly imparting a mechanicallymeasured, backward rotation to the platen to retract the carbons and theinterleaved work-Web from iinal Writing position to carbon-shiftingposition, and for rapidly imparting av r mechanically measured forwardrotation to 5" the platen to advance the Work-web exactly a form lengthWhile the'carbons are held stationary by the carbon clamping means. Thesecond mentioned operation of the platen-sweep mechanismeffects ameasured relative shift of the Work-Web and carbons, and, in addition,mechanically locates the Work-web for severing. .The platen-sweep-`mechanism Jcomprises a platen-sweep handle which is normally connectedto the platen to travel Whenever the platen is rotated, but

which is disconnectible from the platen foi` movement relativelythereto, when desired.

In beginning the Work upon the machine, the carbons are firstinterleaved `With the second form-section upon the Work-web, and the weband carbons are then introduced into the machine from the rear, thecarbons' being brought to theirl carbon-shifting position, and theplaten-sweep'handle being located at the rear'limit of its movement.The'platen is then advanced, by the platensweep handle if desired, tofeed the Workweb and carbons forward to the first Writ- Y During thisbackward movement the Workweb and carbons move yin unison. The clampsare applied to clamp the protruding marginsv of the carbons,independently of the Work-web. to detain the carbons stationary and theplaten-sweep handle is next drawn forwardqrapidly until arrested in adefinite position by an adjustable stop located at a predetermined,measured distance from the fixed rear stop, to produce a relative shiftof exactly a 'form-length.

This position of the Work-Web may conveniently beused as a Web-severingposition, and the machine is accordingly provided with a web-severingknife, mounted to register with vthe leading edge of the form justtyped, in the positionoccupied by it at this stage. ,of the operation.The form-section preceding the one just typed is, therefore, torn ofi1by the aid of the knife at this time.

The operator next disconnects the platensweep handle from theplaten,moves it to `carbons to the carbon-shifting position.

the rear into engagement with its fixed stop, and there reconnects it tothe platen. At this stage, the clamps are moved to ineffective positionsand the platen is rotated a short distance toadvarce the carbons and thefresh form-section, with which the carbons have become interleaved byreason of the relative' shift-ing, to rst writingl line position. Thiscompletes the cycle of operations which is repeated for each succeedingform-section( In accordance with-y one feature of the invention,provision is made of means, actuated bythe platen-sweep handle, forautomatically rendering the carbon-clamps effective and ineffective atthe appropriatetimes. To this end, a clamp-controlling member isarranged to be engaged and actuated by the platen-sweep handle intherlast portion of its backward movement, and con-- nections areprovided from this member to the clamp to cause the clamp to be renderedalternately effective and ineffective by suc-` cessive actuations ofsaid member.

The arrangement is suclnthat lthe platen-sweep handle, in the last partof its rearward stroke whereby the work-web and carbons' are retractedin unison to carbon-shifting position, actuates the clamp-controllingmember to snap the clamps to effective positions, and. in the past partof its other rearward stroke, which is an idle stroke, actuates themember to render the clamps ineffective, so that. the carbons may be-fed forward with the work-web. f

It will be seen that the platen-sweep mechanism accomplishes therelative shifting of the carbons and work-webs very rapidly, and 'thatits operation is measured at every stage, so that it is unnecessary forthe operator to see'- the position of the carbons, orto observe therelation of the work-web to them, either at the beginning or at thetermination of the carbon-shifting operation. The operator, at theconclusionof writing a form section, is required merely to Inove theplaten-sweep handle backward against the rear stop, then forward againstthe adjustable front stdp, then to.tear off the end section of the web,move the handle idly to the rear stop and then yforward a short distanceto advance the work to Writing position.

Other features and advantages will hereinafter appear. v

In the accompanying drawings,

Figure 1 is a side elevation, partly broken away, showing the novelmechanism of the present invention and so much of the old mechanism asis necessary to. an understanding ofthe invention.

Y Figure 2 is a diagrammatic side elevation, showing the parts inpositions occupied b v them in the course of typing a form-section.

Figure 3 is a front elevation Iof the mecha-l nism shown in Figure 1.

positions occupied by them when typingis effected at the lower end of aform.

Figure 6 is a diagrammatic side elevation, showing the parts'in thepositions occupied when the platen-sweep handle has been moved to therear to locate the carbons in carbon-shifting position.

l F igure 7 is a diagrammatioside elevation,

showingy the parts in web-severing position,

that is, just at the conclusion of a carbonshifting operation.

Figure 8 is a diagrammatic side elevation, showing the parts in thepositions occupied after thefend web-section has been severed and theplaten-sweep handle has been returned tothe rear, but before said handlehas been reconnected to the platen.

The typewriting machine comprises a cy-V lindrical platen 10 journaledby its axle 11 in ends 12 of a platen-frame 134 that is movable inletter feed and ret-urn directions in the usual manner. Feed-rolls 14co-operate with the platen to feed back and forth a continuous work-web15 that is led to the platen over a high rear paper-table 16 from asource of supply. x

In beginning the work upon 'theworh- A web 15,. discrete carbons 17 o fgreater Width y than the work-web are interleaved with the secondform-section thereof in such manner that they protrude at both sidemargins beyond the sides of the work-web; or, if a fanfold web is used,so that each carbon protrudes at one of it side margins.

introduced into the machine from the rear of the platen and is advanceduntil the carbons are located in the position shown in Figure 1, whichis the carbon-shifting position.

small gear 18 fast upon it which meshes with a larger gear 19A fast upona shaft 20 journled in a sleeve21 that forms part of a supportingbracketl 22 carried Iby a` baseplate 23 `secured upon the rightv end 12' of the platen-frame 13. The shaft20 also has fast upon it a driverwheel 24 havingsharp pointed teeth 25 for interlocking engagement. withsharp pointed teeth 26 of a latch 27 carried by a platen-sweep `handle28 The workweb 15 with the interleaved carbons 17 is At its right endthe platen-axlevll has a4 which is rotatably mounted upon the shaft.

20. A spring 29 connected to the platensweep handle'28 and to the latch27 normally maintains the latch in engagement with the driver wheel 24and hence maintains driving connection between the -platensweep handleand the platen.

The latch 27 has elongated slots 30 through which pass the shanks ofscrews 31 that are threaded into the platen-sweep handle 28 to hold thelatch upon the handle but in a 'manner to permit movement of the latchtoward and from the driver Wheel 24. When the Work-web and carbons 17have been brought to the carbon-shifting'position described, the latch 27 may be moved longitudinally of the platen-sweep handle 28 Aby means ofa finger-piece32 to disconnect the handle from the platen, so that thehandle may be moved to the rear until arrested by engagement of aprojection 33 uponit with the base-plate 23. The handle 28 in thisposition is connected to the platen by permitting the s ring 29 to drawthe latch 27 toward the river Wheel .24` so that the handle may beactuated to feed-the work forward to typing position, and may beadvanced by the plateny at the line-spacing of the Work as the typingproceeds. lVhen the formsection With which the carbons 17 areinterleaved has been advanced to typing position and has been typed, theplaten-sweep handle is thrust to the rear tovitsinitial position asshown in Figures 1 and 6, and this retracts the work-web 15 and theinterleaved carbons lio a definite uniform position.

17 to the position shown inv Figures 1 and 6,..

that is, to their initial position with the f carbons in carbon-shiftingposition. At this stage, clamps 34 are made effective to grip theprotruding side margins of thecarbons 17 at their ends remote from theyplaten to hold the carbons stationary While the work- `web 15 isadvanced relatively to them. The

ped from the typed web-section and interleaved with the next section ofthe web. For the purpose of measuring this relative shifting, provisionis made of an adjustable stop 35 arranged to intercept a projection 36on the platen-sweep handle and to arrest the handle. The\stop 35 iscarried by an arm 37 rotatably m'ounted on the shaft 20, that carries ascrew 38 which is arranged to be turned to fit between teeth 39 of asegment 40 forming part of the bracket 22. These teeth 39 are located atspaces corresponding to line-space intervals, so that theadvance of thework-web 15 relative to the carbons 17 may be varied in accorda-nce withthe length of form used.

The conclusion ofthis relative shifting operation is alwaysthe same,that is, the line of division between the end section of the workweb andthe section which has just been typed and stripped from the carbonsoccupies This position,

therefore, may conveniently be` the webos'ition of the work-web 15 atthel severing position. Provision is made of a lknife 41 which .ismounted on standards 42 extending upward from the bracket 22y and fromthe left-hand base-plate 23. These standards are provided with threadedopenings 43 at equally spaced intervals, any pair of which may beutilized for ,the reception of knife supporting thumb screws 44, sothatv the knife 41 may be adjusted in various positions according to thelength of the fornisection used.

An upwardly extending web-supporting finger 45 is mounted upon across-bar 46 connecting the standards 42, to hold the web 154conveniently near the knife 41, so that the operator may seize itreadily, and to prevent the webs passing a second time around theplaten. Y'

After the severing of the work-web, the platen-sweep handle 28 isdisconnected from the platen by pulling outward on ythe fingerpiece 32andthe handle is moved to its extreme rear position and therereeonnected vto they platen by releasing the finger-piece.

At-the conclusion of this backward movement of the platen-sweep handle28 the clamps 34 are made ineffective, to permit the carbons -17 to beVadvanced with the workweb 15 to writing position.

Mechanism is provided .for automatically rendering the clamps effectiveand ineffective at the appropriate times. The clamps 34 are fast upon 'atransversely extending shaft 47. which also. has fast upon it anoperating arm 48. A spring 49 conneeted'to the operating arm and to aprojection 5 0 on the rear papertable tends always to move the clamps34. to effective positionl A cam-follower 51 Amount-ed in guides 52 andconnected to the arm 48 rides upon the surface of a cam 53 fast toashaft 54 journaled in brackets 55. l

This cam 53 has alternate high and low parts which are so arranged thatthe clamps 34 are rendered ineffective when a high part of the camengages the follower 51 and are permitted to be made effective bythespring 49 when a lou7 part of the cam engages the follower. The cam53 is rotated step by step .to bring its high and low parts alternatelyto effective position by means of av ratchet-wheel 56 fast onS the shaft54.

An oscillatory arm 57 \]oose on the shaft 54 carries a pawl 58 forco-operation ywith the ratchet-wheel 56. The oscillatory -arm 57 alsocarries a pitman, 59 whichis held by a'guide 60 inthe path of theplatensweep handle 28. When the platen-sweep handle 28 is moved to itsextreme rear position it engages the pitman 59 on the oscillatory arm 57to feed the ratchet-wheel 56 one tooth space. This serves to bring ahigh part ofthe cam 53 opposite the follower`51 if a low part waspreviously effective, or to bring a low part yopposite the follower if ahigh part was previously effect-ive.

52 on the rear paper-table.

It will now be understood that when the platen-sweep handle 28 is-flrstmoved to the rear to retract the carbons 17 and the workweb together tothe position of Figure 6,`

the movement of the pitman by the handle causes the clamps to be madeeffective. The lcam 53 is so contoured that the sprlng 49 is caused tosnap the clamps 34v to effective 1 Y position at the very end of therearward movement of the platen-sweep handle 2 8. The handle 28 is nextdrawn forward to advance the work-web while the earbons are heldstationary by the clamps 34, and is then disconnected from the platenand returned idly to the rear. At the conclusion of the idle rearwardmovement of the platen-sweep handle 28, the actuation of the pitman 59by said handle causes the clamps 34 to be made ineffective (see'Figure8), so that the carbons 17 may be advanced with the workweb 15 towriting position,

It will be noted that the carbons 17 are drawn entirely clear of -theplaten, at the rear thereof, for carbon-shifting, and hence that theleading edge of the work-web section with` which they are interleaved is.drawn a substantial distance below7 the line yof writing. The stop iseffective to arrest rotation ofthe platen when the work-web has beenadvanced exactly a form length from this osition at carbon-shifting. Itis desirable, owever,to permit a greater advance of the handle-28 attyping in order to permit typing to be effected near ,the bottom of theform, that is, in order -that the leading edge of the form may be fedfromv carbon-shifting position around to the line of Writing and thenadvanced substantially a form length from that point. The stop 35 istherefore constructed to arrest the platensweep handle 28 when thehandle isl advanced rapidly as at carbon-shifting, but

-tov permit theV handle to pass. it when the handleis advanced slowly asat line-spacing, To this end the stop 35 is pivote-d upon the arm 37land normally urged in a counter- -clockwise direction by a Lspring a,as

viewed in Figures 1, 5 and 7, tomain- ,tain its nose 61! lclear of theproi' jeetion 36 carried by the platen-swee handle 28. The stop 35has atail 62 whic extends into the path of a second projection 63 carried bythe platen-sweep handle 28. The arrangement is such ythat thesecondprojection 63 strikes the tail 62*l at'the advance of the handleswinging the stop .35 clockwise to throw the nose 6I Intov the pathvbase-plates.

of the projection 36 (see Figure 7). If the 3 handle 28 is beingadvanced rapidly, the I so that the line-feeding of the work can becontinued to the bottom of the form.

The knife-supporting standards 42 are y.sr-.pported at their lower endsupon the forward ends of the base-plates 23, and are additionallysupported by brackets 64 extending upward from the rear ends of said Thestandards 42 are'further combined with the rear 'paper-table 16, to forma rigid truss therewith, by means .of webbing `65. In this way, thestandards'42 and the paper-table 16 are caused to brace one another.

Ithas been pointed out that the stop 35 may be adjusted by line-spaceunits as determined by the lusual line-space ratchetwheel66 andco-operating detent 67. Since the platen will always be advanced,therefore, a whole number of line-spaces, .the detent 67 will help todetain the platen sta'- tionary during the idle backward movement of thehandle, and the handle can be connected to the platen when at the rearlimit of its movement without tion of the platen at all.

valtering the posi- 1 0 The form can be varied in length Within y awiderange so long as it is of alength equal toa whole number ofline-spaces.

Since a distance of two form-lengths intervenes betweemtherear ends ofthe carbons in carbon-shifting position vand the knife, the. provision'of o enings 43 at' double-line-space intervals or' the attachment of theknife will accommodate single-'line-space variations in the length ofform used.

' Variations may be resorted to within the scope of the invention, andportions of the llO improvements may be used without others. Hrw-'mgthus described my lnvention, Inl

claim: v

1. In a ycontinuous billing typewriting machine, the combination with arevoluble platen, of a. set of discrete carbons feedable around theplaten with an interleaved workweb, means for holding the earbonsstationary in a' definite predetermined carbon-shifting positionwhere-1n they are straight and free of the platen, means for sweepingthe platen forward and backward, means for limiting the backwardv sweepof the platen to arrest the work-web and carbons in carbon-shiftingposition, and means for limiting the forward sweep ofthe platen toarrest' the work-web when it has been advanced a lthe work-web at theconclusion of said forward sweep of the platen.

predetermined distance from the carbonshifting position.

2. In a continuous billing typewriting machine, the combination with arevoluble platen, of a set of discrete carbons feedable around theplaten with an interleaved workweb, means operable to clamp the carbonsstationary in a. definite predetermined carbon-shifting position whereinthey are straight and free of the platen, means for sweeping the platenforward and backward, means for limiting the backward sweep of theplaten to arrest the work-web and carbons in exact carbon-shiftingposition, means v for limiting the forward sweep of the platen to arrestthe work-web when it has been advanced exactly a form length fromv the.carbon-shifting position, land a web-sever- -ing knife located toregister with.' the line of division between two form-sections on 3. Ina continuous billing typewriting machine, the combination with arevoluble platen, of a set of discrete carbons vfeedable around theplaten with an interleaved work- -web, means for holding the carbonsstationary in a definite predetermined carbon-shiftzing positionwher-ein they are straight and free of the platen, means for .sweeping'the platen backward tov locate the workweb and carbons incarbon-shifting position, and for sweeping the platen forward to effecta v .relative shift of the workweb and carbons,

means for. limiting the backward sweep of the platen yto arrest thework-web and carbons in exact carbon-shifting position, means fordlimiting the forward sweep of the platen to arrest the work-web when it'has been advanced exactly a form length from the carbon-shiftingposition, and means operable to disconnect the platen-sweep means fromthe platen to permit retraction of said means independently of theplaten, following the carbon-shifting sweep of theplaten.

4. In a continuous billing typewriting ma.- chine, the combination witha revoluble platen, of a set of discrete carbons feedable around theplaten with an interleaved Work-y web, means for holding the carbonsstationary ina denite carbon-shifting position wherein they arestraight'and free of the Y platen, meansfor sweepingthe platen backwardto locatel the worklweb and carbons in a definitepredeterminedcarbon-shifting .position, and -means operated by said platen.- sweepinmeans to clamp the' carbons independentvy 'of the work-web to hold themstationary in carbon-shifting position while .the work-web is advancedrelatively to them. 5. Ina continuous billing typewritig machine, thecombination with a revoluble pla-ten, of a set of discrete carbonsfeedable around the platendwith aninterleaved work- Xabi-meander,retatingfthe'Pleeiabaakwd to locate the Work-web and carbons in -a denite predetermined carbon-shifting position, and for rotatlng theplaten forward to advance the work-web for shifting it relatively to thecarbons, clamping means oper-` able/ prior to the relative shift of theworkweb and carbons 'to clamp thecarbons stationary, and operable aftersuch relative shift to release the carbons, and mechanism ope-rated bythe platen-rotating means to control the effective and ineffectivecondition of said clamping means. Y. 6.A In a continuous billingtypewriting machine, the4 combination with Aa ,revoluble platen, ofaset-of carbons feedable around 'i the platen with an interleavedwork-web. means for clamping the carbons stationary in a definitecarbon-shifting position wherein they are straight and free of theplaten, and a single platen-sweep handle connected to sweep the platenbackwardto locate the work-web and carbons 'in carbonfshifting position,and tosweep the platen yforward to effect' a relative shift of thework-Weband carbons.l L

7. In a continuous billing typewriting machine, the' combination 'with'al revoluble platen, of a -set of` carbonsffeedable around the platenwith an interleaved work-web,

means for clamping the carbons stationary in a definite carbon-shiftingposition wherein they are straight and free of theiplaten, a' singleplaten-sweep handle connected to sweep the platenxbackward tolocate thework-'web 'and carbons `in carbon-shifting position, and to` sweep theplaten forward to effect a relative shiftof the work-web and carbons,and means operated bythe platensweep handle'in said backward platen'-svveeping -movement to make the carbonclamping means effective.

8. lIn av continuous'billing typewriting machine, the combination with arevoluble platen', ofl a set of discrete carbpnsfeedable 1 around theplaten withan interleaved workweb, means for imparting amechanicallymeasured movement` to the work-web and carbonsl to feed'them together from final writing position to a definite predetermined'platen-sweep handle movable-from a mechanf' ically-limited rear-lposition'tol av'mechancally-limited forward position for imparting ameclianically-measured forward move- ,mentv tothe Vwork-webindependently of the Gerbens,-vhle-thearb 11a-@rah ldtation aryy bythecarbon-clamping means, the` platen-sweep handle being disconnectiblefrom the platen and movable idly from said forward position to saidrearward position following the measured feeding of the workweb, andmeans operated by the idle rearward movement of the platen-sweep handleto release the carbons from said clamping means.

10. In'a continuous billing typewriting machine, the combination with arevoluble platen, ofa set of carbons feedable around the platen with aninterleaved work-web, means for holding the carbons stationary in adefinite. predetermined carbon-shifting position while the work-web isadvanced relaL tively to them, a yplaten-rotating handle for moving thework-web and carbons from final writing position to carbon-shiftingposition,

and a stop for limiting the movement of the platen-rotating handle tothe carbonshifting position, the handle 'being connected to the platento be advanced by at linespacing of the work, so that the return of thehandle to the. stop, will always return the work-web and carbons to theposition originvally occupied by them with the handle at the stop.

11. In a continuous billing typewriting machine, the combination with arevoluble platen, of a' set of carbons feedable around the platen withan interleaved work-web,

A web.

means for holding the carbons stationary in. a definite predeterminedcarbon-shiftnig position while the work-web is advanced relatively tothem, and a platen-sweep handle for rotating the platen to feed theworkv web and carbons from final writing position to saidcarbon-shifting position.

12. In a continuous billing typewriting machine, the combination with arevoluble platen, of a set of Vdiscrete carbons, means to conductv the-carbons and an interleaved jwork-web to-the platen from the rear thereyis advanced relatively to them, means for detaining the carbonsstationary during such Y relative advance of the work-web, and means formeasuring said advance of the work` 13. In' continuous billingtypewriting machine,'the combination with a revoluhle platen, of a setof discrete carbons feedable around the platen with an interleavedworkweb, means for imparting a mechanically' measured movement to thework-web and carbons in one direction to feed them together from finalwriting positionl to a. deliuite predetermined carbon-shifting positionand for imparting a mechanically measured movement vto the work-web inthe opposite direction to edect a relative shift between the work-weband carbons, and means for clamping position during the latter movementof the work-web.

14. In a continuous billin typewriting machine, the combination Wit arevolublev platen, ofl a set of discrete carbons feedable around theplaten with an interleaved work- Web, means operable to clamp thecarbons stationary in a definite predetermined carbon-shifting positionwherein they are straight and free of the platen, means for sweeping theplaten forward and backward, means for limiting the backward sweep ofthe platen to arrest the work-web and carbons in exact carbon-shiftingposition, means for limiting the forward sweep of the platen to arrestthe work-web when it has been advanced exactly a form length fromthecarbon-shifting position, a web-severing knife located to registerwith the line of divisi-on between two form-sections of the work-web atthe conclusion of said forward sweep of ysweeping the platen forward andbackward,

means for limiting the backward sweep of the platen to arrest thework-web and carbons in exact carbon-shifting position, means forlimiting the forward sweep of the platen to arrest the work-webwhen ithas been advanced exactly a form length from the carlbon-shiftingposition, a web-severing knife located to register with the line ofdivision between two form-sections on the work-web at the conclusion ofsaid forward sweep of the laten, the means for limiting the forward)sweep of the platen being adjustable to change the extent of forwardsweep by any-whole number of line-spaces, and means for adjusting theknife at double line-space intervals to correspond with the adjustmentsof said sweep-limiting means.

16. In a continuousbilling typewriting machine, the combination with arevoluble platen, of a` set of carbons` means for locating the carbonsand an interleaved work-web in a definite predetermined carbon-sh1ft1ngposition at a substantial distance from the writing line of the machine,means for structedto arrest the platen-sweep mechanism at the rapidadvance of the'platen when the Work-Web has been swept forward a formlength, but to permit the Work to be advanced* more than a form lengthfrom carbon-'shifting position When the platen is advanced slowly attyping.

17 .In a continuous billingv typeWriting machine, the combination with arevoluble platen, of a set ofv carbons, means for locatjing thel carbonsand an interleaved Workveb in a definite predetermined carbon-shiftingposit-ion, means' for detaining the carbons in said position While theWork-Web is advanced relatively to them,- platen-sweep mechanism foradvancing the Work-Web relatively to the carbons, and means for'arresting the platen-sweep mechanism when the Work-Web has' beenadvanced Aa. forni length from carbon-shifting position, said meanscomprising a pivoted stop, a spring normally holding the stop in anineffective position, and a tail on the stop enga-geable by theplaten-sweep handle to rock the stop to effective position, thearrangement being such that the handlewill engage the stop in effectiveposition when vadvanced rapidly,

but that the spring will restore the stop to ineffective positionWithout arresting the handle When the handle is advanced slowly.

18. In a continuous billing typewriting machine, the combination with arevolnble platen, of a set of carbons, means for detaining the carbonsstationary in a definite carbon-shifting position While the lWork-Web lis' advanced relatively to them, platen-sweep mechanism connected to theplaten to sweep it vfor effecting the advance of the work- ,iv'ebrelatively to the carbons and alsoadvanceable bythe platen at typing inpreparat-ion -forr a measured retraction by the handle of the Worl -Weband carbons together to carbon-shifting position, and

means constructedl and arranged to arrest the advance of theplaten-sweep handle at carbon-shifting when the work-Web has beenadvanced a form length from carbonshifting position, butto permit agreater 4advance of the Work-web and carbons to gcther at typing. e

19. In a continuous billing typewriting machine, the combination with arevoluble platen, of a set of discrete carbons, a platensweep handlearranged to be advanced with f and by the platen at typing, then to berctracted to return the Work-Web and carbons to a .definitepredetermined carbonshifting position, then to be advanced to feed theWork-Web a form length relatively to the carbons, and then to beretracted idly While disconnected from the platen for reconnection tothe platen at a different point.l

clamps for holding the. carbons stationary in. carbon-shifting position,and controllingr of the platen-sweep handle to feed thev cam, thearrangement being such that the clamps are made effective by themovement ofthe handle that returns the Work-weh and carbons-tocarbon-shifting position andare made ineffective by the idle backwardmovement of the platen-sweep handle.

20. In a continuous billing typewriting machine, the combination with arevoliible platen, of a set of discrete carbons, a platensweep handlearranged to be advanced with and by the platen at typing, then to beretracted to return the work-web' and carbons to a definitepredetermined carbonshifting position, then to be advanced to feed thework-Web a form length 'relatively to the carbons, and then to 'beretracted idly While disconnected from the platen for reconnection tothe platen at a different point, clamps for holding the carbonsstationary in carbon-shifting position, and means operated by thebackward movement of the platen-sweep handle that returns the Work-weband carbons to carbon-shifting position to snap the clamps to effectivepositions.

21. In a continuous billing typewriting ymachine, the combination with arevoluble platen, of a set of discrete carbons, a platensWee handlearranged to be advanced with and y the platen at typing, then to beretracted to return theivork-iveb and carbons to a definitepredetermined carbon-shifting vby the backward movements of theplatensweep handle, a ratchet feedable step by step by the pawl,- a camfeedable by the' ratchet, and mechanism controlled by the cam to renderthe clamps alternately effective and ineffective at t-lie backwardmovements of the platen-sweep handle.

22, In a continuous billing typevvritingmachine, the combination with, arevoluble platen, of a set of discrete carbons, a platensweep handlearranged to be advanced With andby the platenat typing, then to beretracted to return the work-Web and carbons to a definite predeterminedcarbon-shifting position, then to be advanced to feed the Work-Web aform length relatively to the carbons, and then to be retracted idlyWhile tion to the platen at a different point, clamps for gripping theside margins of the carbons independently of the Work-web for holdingthe carbons 'stationary in carbon-shifting position, a rock-shaft onWhich the clamps are mounted, a spring normally1 urging the rock-shaftin a direction to make the clamps effective, a cam-follower for holdingthe clamps ineffective, and la cam controlling the follower and arrangedto be operated by the backward movementk of the platen-sweep handle thatreturns the Work- Web and carbons to carbon-shifting position, the camhaving a sudden drop arranged to be brought opposite the follower bysaid feeding to permit the spring to snap the clamps to etleetivepositions.

In a continuous billing typewriting' machine, the combination with avrevoluble platen, of la high paper-table at the rear of the platen tosupport the Work-Web and carbonsl in acarbon-shifting position, aknife-supporting frame at the front of the platen, a Work-severing knifeon the frame., and webbing connecting 'the high rear paper-table and theyknife-supporting frame to cooperate With them to form a rigid truss, sothat each supports and .reinforces the other. i

24. In a continuous billing typewriting machine, the ,combination with arevoluble platen, of a knife-supporting frame at the front of theplaten, a knife supported upon the frame for" severing the work-Web, andan upwardly-extending Web-supporting iinger carried by the frame behindthe Work- Web to hold the Web conveniently near the knife to be graspedby the operator for severing and to prevent 'the Webs passing ff asecond time around the platen.'

CLARENCE M. oREWs.

